Gamma-ray decay schemes forKr93,Rb93, andSr93

Abstract

The $\ensuremath{\gamma}$ rays following the $\ensuremath{\beta}$ decays of $^{93}\mathrm{Kr}$, $^{93}\mathrm{Rb}$, and $^{93}\mathrm{Sr}$ have been studied, using Ge(Li) detectors for singles and coincidence measurements. A level scheme for $^{93}\mathrm{Y}$ is reported which contains 36 excited levels and 143 of the 162 observed $\ensuremath{\gamma}$ rays in the decay of $^{93}\mathrm{Sr}$. For the decay of $^{93}\mathrm{Rb}$, 243 $\ensuremath{\gamma}$ rays were observed, with 231 placed in a level scheme for $^{93}\mathrm{Sr}$ consisting of 74 excited levels. The decay of $^{93}\mathrm{Kr}$ was observed to have 217 $\ensuremath{\gamma}$ rays, 203 of which are placed in a level scheme for $^{93}\mathrm{Rb}$ comprising 56 excited levels. Over 98% of the observed $\ensuremath{\gamma}$-ray intensity is contained in each of the level schemes. Spin and parity assignments are proposed, whenever possible, on the basis of $\ensuremath{\gamma}$-ray transition probabilities and deduced $log\mathrm{ft}$ values. A comparison is made with available reaction data for the $^{93}\mathrm{Y}$ level scheme, and some of the levels in each decay scheme are interpreted in terms of the nuclear shell model.RADIOACTIVITY $^{93}\mathrm{Kr}$, $^{93}\mathrm{Rb}$, $^{93}\mathrm{Sr}$ [from $^{235}\mathrm{U}(n, f)$]; measured ${E}_{\ensuremath{\gamma}}$, ${I}_{\ensuremath{\gamma}}$, $\ensuremath{\gamma}\ensuremath{-}\ensuremath{\gamma}$ coin. Ge(Li) detectors. $^{93}\mathrm{Rb}$, $^{93}\mathrm{Sr}$, $^{93}\mathrm{Y}$ deduced levels, $J$, $\ensuremath{\pi}$, $log\mathrm{ft}$. Mass-separated $^{93}\mathrm{Kr}$ activity.